syscall: Move Errno into its own file, for RTEMS.

From-SVN: r182356

libgo/Makefile.am

@@ -1549,6 +1549,7 @@ endif
 
 go_base_syscall_files = \
 	go/syscall/env_unix.go \
+	go/syscall/syscall_errno.go \
 	go/syscall/libcall_support.go \
 	go/syscall/libcall_posix.go \
 	go/syscall/socket.go \

libgo/Makefile.in

@@ -1886,6 +1886,7 @@ go_unicode_utf8_files = \
 @LIBGO_IS_LINUX_TRUE@syscall_netlink_file = go/syscall/netlink_linux.go
 go_base_syscall_files = \
 	go/syscall/env_unix.go \
+	go/syscall/syscall_errno.go \
 	go/syscall/libcall_support.go \
 	go/syscall/libcall_posix.go \
 	go/syscall/socket.go \

libgo/go/syscall/syscall_errno.go

+// Copyright 2009 The Go Authors. All rights reserved.
+// Use of this source code is governed by a BSD-style
+// license that can be found in the LICENSE file.
+
+package syscall
+
+// An Errno is an unsigned number describing an error condition.
+// It implements the error interface.  The zero Errno is by convention
+// a non-error, so code to convert from Errno to error should use:
+//	err = nil
+//	if errno != 0 {
+//		err = errno
+//	}
+type Errno uintptr
+
+func (e Errno) Error() string {
+	return Errstr(int(e))
+}
+
+func (e Errno) Temporary() bool {
+	return e == EINTR || e == EMFILE || e.Timeout()
+}
+
+func (e Errno) Timeout() bool {
+	return e == EAGAIN || e == EWOULDBLOCK || e == ETIMEDOUT
+}

libgo/go/syscall/syscall_unix.go

@@ -157,25 +157,3 @@ func Mmap(fd int, offset int64, length int, prot int, flags int) (data []byte, e
 func Munmap(b []byte) (err error) {
 	return mapper.Munmap(b)
 }
-
-
-// An Errno is an unsigned number describing an error condition.
-// It implements the error interface.  The zero Errno is by convention
-// a non-error, so code to convert from Errno to error should use:
-//	err = nil
-//	if errno != 0 {
-//		err = errno
-//	}
-type Errno uintptr
-
-func (e Errno) Error() string {
-	return Errstr(int(e))
-}
-
-func (e Errno) Temporary() bool {
-	return e == EINTR || e == EMFILE || e.Timeout()
-}
-
-func (e Errno) Timeout() bool {
-	return e == EAGAIN || e == EWOULDBLOCK || e == ETIMEDOUT
-}